CTERMID(3) Library Functions Manual CTERMID(3)

ctermid — generate terminal pathname

#include <stdio.h>

char *
ctermid(char *buf);

The () function generates a string that, when used as a pathname, refers to the current controlling terminal of the calling process.

If buf is a null pointer, a pointer to a static area is returned. Otherwise, the pathname is copied into the memory referenced by buf. The argument buf is assumed to point to an array at least L_ctermid (as defined in the include file <stdio.h>) bytes long.

The current implementation simply generates "/dev/tty".

The ctermid() function returns a non-null pointer, which is equal to the buf argument if it is not NULL.

The current implementation detects no error conditions.

ttyname(3)

The ctermid() function conforms to IEEE Std 1003.1-1988 (“POSIX.1”).

January 21, 2014 OpenBSD 7.6